The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 29, 1987
Filed:
May. 29, 1986
Gustav Rohr, Heidelberg, DE;
Gerd Nohl, Rauenberg, DE;
Frankl & Kirchner GmbH, Schwetzingen, DE;
Abstract
A device for detecting an overlapping edge of material on a sewing machine has, in combination, a signal-level discriminator and an optical waveguide. The optical waveguide has a light-receiving end on the sewing machine for receiving light through the overlapping edge of the material. The optical waveguide may be an optic fiber which, because of its small, flexible size can be accommodated easily even in the crowded sewing head or bed of an industrial sewing machine. The other end of the optical waveguide is remote from the light-receiving end for providing the received light to the signal-level discriminator which, therefore, is also remote from the crowded sewing head or bed of the sewing machine which, in addition, could interfere with its operation. For operation, the signal-level discriminator has an electro-optic sensor responsive to the light from the optical waveguide and a detector electrically responsive to light sensed by the electro-optic sensor for determining an absolute, light-intensity value of the sensed light which, therefore, detects the overlapping edge of the material accurately the corresponding change in determined light intensity.